Nitrogen-doped hard carbon material and preparation method and application thereof

A nitrogen-doped, hard carbon technology, used in carbon preparation/purification, electrical components, electrochemical generators, etc., can solve the problems of limited development, unfavorable promotion, high reaction temperature and economic cost, and reduce charge transfer resistance. , the effect of promoting diffusion and improving electrode kinetics

Pending Publication Date: 2021-10-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings of these traditional synthesis of N-doped carbon materials are obvious: high reaction temperature and expensive equipment will bring pressure on economic costs, and these synthetic methods are not conducive to the promotion of industrialization
The limiting factor of fewer strategies for the synthesis of nitrogen doping mainly limits the development of high-performance N / O-doped carbon materials.

Method used

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  • Nitrogen-doped hard carbon material and preparation method and application thereof
  • Nitrogen-doped hard carbon material and preparation method and application thereof
  • Nitrogen-doped hard carbon material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A method for preparing a nitrogen-doped hard carbon material, comprising the following steps:

[0040]S1. Carbon source preparation (primary purification): select pomelo peel as the precursor carbon source, remove the inner and outer skins, take the main woody part, wash it with distilled water three times, dry it in an oven at 120°C for 24 hours, and then use a high-energy The pulverizer is pulverized at a speed of 6000r / min for 5min, and 325 mesh pomelo peel powder is screened out;

[0041] S2, secondary purification: take by weighing the pomelo peel powder in 100g step S1 and place in the round bottom flask, under the reflux condensation operation of condensed water, add the dilute nitric acid that concentration is 10wt% in the round bottom flask, then in the oil bath pan reflux at 80°C for 1 hour, finally filter, wash with distilled water three times, and dry in an oven at 120°C for 24 hours to obtain secondary purified pomelo peel powder;

[0042] S3. Calcination:...

Embodiment 2

[0045] A method for preparing a nitrogen-doped hard carbon material, comprising the following steps:

[0046] S1. Carbon source preparation (primary purification): select pomelo peel as the carbon source of the precursor, remove the inner and outer skins, take the main woody part, wash it with distilled water three times, dry it in an oven at 120°C for 24 hours, and then use high-energy pulverization The machine was crushed at a speed of 6000r / min for 5 minutes, and 325-mesh pomelo peel powder was screened out;

[0047] S2, secondary purification: take by weighing the pomelo peel powder in 100g step S1 and place in the round bottom flask, under the reflux condensation operation of condensed water, add the dilute nitric acid that concentration is 10wt% in the round bottom flask, then in the oil bath pan Reflux at a temperature of 80° C. for 1 h, and finally filter, wash with distilled water three times, and dry in an oven at 120° C. for 24 h to obtain secondary purified pomelo ...

Embodiment 3

[0051] A method for preparing a nitrogen-doped hard carbon material, comprising the following steps:

[0052] S1. Carbon source preparation (primary purification): select durian shell as the precursor carbon source, peel it, take its woody main part, wash it with distilled water three times, dry it in an oven at 120°C for 24 hours, and then use a high-energy pulverizer Grinding at a speed of 8000r / min for 10 minutes, and sifting out 325-mesh durian shell powder;

[0053] S2, secondary purification: take by weighing the durian shell powder in 100g step S1 and place in the round-bottomed flask, under the reflux condensation operation of condensed water, add the dilute nitric acid that concentration is 10wt% in the round-bottomed flask, then in the oil bath pan reflux at 80°C for 1 hour, finally filter, wash with distilled water three times, and dry in an oven at 120°C for 24 hours to obtain durian shell powder after secondary purification;

[0054] S3. Calcination: Weigh 30 g o...

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Abstract

The invention discloses a nitrogen-doped hard carbon material as well as a preparation method and application thereof, and the preparation method of the hard carbon material comprises the following steps: pretreating, drying and crushing a biomass raw material to obtain primarily purified biomass raw material powder; adding the biomass raw material powder into dilute nitric acid, heating, cooling to room temperature, filtering, washing and drying to obtain secondarily purified biomass powder; calcining the secondarily purified biomass powder in an argon atmosphere, and cooling in the argon atmosphere to obtain a biomass hard carbon material; and placing the biomass hard carbon material in plasma equipment to be treated; wherein the power ranges from 400 w to 800 w, and the treatment time ranges from 0 min to 75 min. The hard carbon material prepared by the invention has the characteristics of high porosity, large specific surface area and large interlayer spacing, and can promote the diffusion of sodium ions and improve the capacity, dynamics, mass transfer speed, cycle performance and first coulombic efficiency of a carbon negative electrode of a sodium ion battery.

Description

technical field [0001] The invention relates to the field of preparation of hard carbon materials, more specifically, to a nitrogen-doped hard carbon material with porous properties, a preparation method thereof, and an application thereof in a negative electrode of a sodium ion battery. Background technique [0002] Sodium-ion battery is a rechargeable battery that can be used as a power source to provide power. It is mainly used for starting batteries for automobile engine starting, backup power storage, power grid regulators, and power grid-connected equipment. The main constituent materials of sodium-ion batteries include electrolyte, separator materials, positive and negative electrode materials, etc. The anode material occupies a large proportion, because the performance of the anode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery. There are many types of anode materials for sodium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/583H01M4/62H01M10/054
CPCC01B32/05H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 纪效波蔡鹏邹国强侯红帅邹康宇肖诩桓
Owner CENT SOUTH UNIV
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